Struts2拦截器的实例

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最近在学习struts2的拦截器，做了一个小例子：

首先写一个登录页面login.jsp

<body><s:form action="login" method="post"><s:textfield name="username" label = "用户名"/><s:password name="pass" label="密码" /><s:submit value="提交" /></s:form></body>

再写LoginAction:

private String username;private String pass;

和两变量的set、get方法

public String execute() throws Exception {// TODO Auto-generated method stubif(isNull(getUsername()))  return INPUT;if(isNull(getPass())) return INPUT;ActionContext.getContext().getSession().put("user",getUsername());ActionContext.getContext().getSession().put("pass", getPass());return SUCCESS;}private boolean isNull(String str) {return str==null||str.length()==0;}

拦截器LoginInterceptor:

 public String intercept(ActionInvocation ai) throws Exception {// TODO Auto-generated method stubMap session = ai.getInvocationContext().getSession();String username = (String)session.get("user");String pass = (String)session.get("pass");if(username!=null&&username.length()>0&&pass!=null){return ai.invoke();}else{return Action.LOGIN;}}

最后配置struts.xml:

<struts><package name="struts2" extends="struts-default"><!-- 配置自定义拦截器LoginInterceptor --><interceptors><interceptor name="loginedCheck"class="com.struts2.interceptor.LoginInterceptor" /><interceptor-stack name="mystack"><interceptor-ref name="loginedCheck" /><interceptor-ref name="defaultStack" /></interceptor-stack></interceptors><!-- 定义全局result --><global-results><!-- 定义名为exception的全局result --><result name="exception">/exception.jsp</result><result name="tologin" type="redirect">/login.jsp</result></global-results><!-- 定义全局异常映射 --><global-exception-mappings><!-- 捕捉到Exception异常(所有异常)时跳转到exception所命名的视图上 --><exception-mapping exception="java.lang.Exception"result="exception" /></global-exception-mappings><!-- 用户登录 --><action name="login" class="loginAction"><result name="input">/login.jsp</result><result name="error">/login.jsp</result><result name="success" type="redirect">/index.jsp</result></action><action name="logout" class="com.struts2.action.LoginAction"><result name="success" type="redirect">/login.jsp</result></action><!-- 系统用户信息管理 --><action name="listSystemUser" class="systemUserAction"method="listSystemUser"><result name="success">/list.jsp</result><interceptor-ref name="mystack" /></action></package></struts>

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